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1.分析并调试下列程序。

//sy6_1.cpp
#include<iostream>
using namespace std;
class Base
{
    public:
        virtual void f(float x){cout<<"Base::f(float)"<<x<<endl;}
        void g(float x){cout<<"Base::g(float)"<<x<<endl;}
        void h(float x){cout<<"Base::h(float)"<<x<<endl;}
};
class Derived:public Base
{
   public:
        virtual void f(float x){cout<<"Derived::f(float}"<<x<<endl;}
        void g(int x){cout<<"Derived::g(int)"<<x<<endl;}
        void h(float x){cout<<"Derived::h(float)"<<x<<endl;}
};
int main()
{
    Derived d;
    Base *pb=&d;
    Derived *pd=&d;
    pb->f(3.14f);
    pd->f(3.14f);
    pb->g(3.14f);
    pb->h(3.14f);
    pd->h(3.14f);